Eye muscles - Extrinsic

Question 1

Which set of muscles moves the eyeball ?

Answer 1

Extrinsic muscles

Question 2

Name the two sets of extrinsic eye muscles.

Answer 2

Recti Muscles (SLIM)

Question 3

5 of the extrinsic muscle originate in the common tendinous ring. Which one does not? Where does it originate.

Answer 3

1. Inferior oblique

2. Originates from the medial orbit surface.

Question 4

What structure causes the superior oblique to make a right-angle turn?

Answer 4

A fibrocartilaginous loop called the trochlea

Question 5

How are the extrinsic muscles attached to the eye ball

Answer 5

The extrinsic muscles are attaches along the orbital axis

Question 6

List the 3 functions of the extrinsic eye muscles?

Answer 6

1. Allow eyes to follow a moving object.
2. Maintain shape of eyeball.
3. Hold eyeball in the orbit

Question 7

Why do we need the obliques to elevate and depress the eye when we have the inferior and superior recti?

Answer 7

Obliques provide the lateral pull needed to counteract the medial pull of the inferior and superior recti.

Question 8

Define strabismus and its symptoms.

Answer 8

1. A congenital weakness of the external eye muscles

2. Causes the eyes to rotate medially or laterally (“cross-eyed”).

Question 9

Name and describe one consequence arising from strabismus.

Answer 9

1. Diplopia (double vision).
2. Unable to focus the images from each eye, so people see two images instead of one.
3. Eyes may alternate focusing, or brain ignores input from weak eye.
4. May lead to functional blindness.

Question 10

List the 4 members of the recti muscle group.

Answer 10

1. Superior
2. Lateral
3. Inferior
4. Medial

Question 11

List the 2 members of the oblique muscle group.

Answer 11

1. Superior

2. Inferior